Process of manufacture of mixed yarns of artificial textile fiber and natural silk threads



Sept. "29, 1942. c s E 7 2,297,458

- PROCESS OF MANUFACTURE OF MIXED YARNS OF ARTIFICIAL v TEXTILE FIBER AND NATURAL SILK THREADS Filed July 11, 1941 Patented Sept. 29, 1942 PROCESS OF MANUFACTURE OF MIXED YARNS 0F ARTIFICIAL TEXTILE FIBER AND NATURAL SILK THREADS Emilio Casteiii, Como, Italy; vested in the Alien Property @ustodian Application July 11, 19%, Serial lilo. 462,6344 In Etaty Juiy 17, 194% 2 Glaims. (or. 1H)

The present invention relates to a new process of manufacturing mixed yarns consisting of artificial textile fiber (rayon) threads.

It is well known that the operation of coupling said two kinds of yarn is usual in textile inand natural silk dustry, either in view of obtaining difierent eflects from dyeing or for imparting a silky touch to the fabrics consisting prevailingly of rayon; or else, mainly, for conferring to rayon fabrics that strength which rayon alone could not attain within the limits of the whatever desired count.

Up to now, the desired mixed yarn is obtained by doubling one or more rayon threads with one or more raw silk yarns, giving to the whole the desired twist. Such a method, besides being considerably expensive, requires a great number of knots with evident unfavourable consequences for the successive working steps moreover, said method requires, which is most important, a mixture having a high content of natural silk, even if a mixture of less content would be suflicient, because the raw silk yams practically available on the market have counts corresponding at least to the coupling of the threads fed by 3 or 4; cocoons together; this fact prevents the. formation of mixed yarns having a lower content, such as those which could be formed by using silk threads from one or two cocoons only.

The process according to the present patent application allows the formation in a very cheap way of mixed yarns of any desired composition. Said process consistsin doubling and thoroughly uniting rayon and silk threads during the silk reeling step or during any other spinning process, from cocoons directly. I

According to a preferred way of carrying out the process, indicated here only as a non-limta-' 7 tire example, a rayon thread is fed to a normal silk reeling apparatus and by means oi a normal cilia reeling or spinning process united with the filaments drawn from one or more cocoons as desired, a real rayon-silk mixed yarn being thus obtained within a verywide rams of possible proportions of content, as it is possible to employ,

as desired, filaments from one or more cocoons.

The accompanying drawing shows diagrammatically, only by way of example, an embodiment of a device for carrying out the process according to the invention, a reeling basin being employed for the above purpose. I is a basin for reeling one or more cocoons 2 from each of which the silk filament 3 is fed to the piecer d. The rayon thread 6 from the bobbin 5 reaches the piecer I through the fixed thread guide I. Th mixed thread I issues from the piecer, passes on thesmall guide wheels 9 and forms the twist where the fibers making up the composite yam become satisfactorily supported by each other; thereafter, the yarn, guided by the movable thread guide III, is wound on the reel ii.

It is understood that it is possible to attain the same purpose also with arrangements difl'erent from the one which has been illustrated. Although with less perfect and more expensive results-it is possible, for instance, to employ, in-

stead of reeling basins, devices not for the reeling.

process, always obtaining, however, the natural silk required for .the mixture directly from the cocoons.

What I claim is: a

1. A process for the manufacture of a mixed yarn composed of artificial textile fiber and natural silk filaments including the steps of removing the silk filaments directly from the cocoon,

and adding the artificial fiber to'thev silk fila-- ment during the removal of the silk filament from the cocoon.

2. A process for the manufacture of a mixed 

